(a-4)*M=a的平方-a+N
得M=（a+?）
(a-4)*(a+?)=a的平方-4a+?a-4?=a的平方-a+N
=3,a的平方-4a+?a-4?=a的平方-4a+3a-4*3=a的平方-a-12
得N=-12
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